知識總結(jié)：普通專升本英語時(shí)態(tài)之過去進(jìn)行時(shí)！

    過去進(jìn)行時(shí)
    1. 概念：表示過去某段時(shí)間或某一時(shí)刻正在發(fā)生或進(jìn)行的行為或動作。
    My brother fell while he was riding his bicycle and hurt himself.
    我兄弟騎車時(shí)摔了下來，受了傷。
    When I got to the top of the mountain, the sun was shining.
    我到達(dá)山頂時(shí)，陽光燦爛。
    2. 時(shí)間狀語：at this time yesterday, at that time或以when引導(dǎo)的謂語動詞是一般過去時(shí)的時(shí)間狀語等。
    3. 基本結(jié)構(gòu)：was/were+doing
    否定形式：was/were + not + doing.
    一般疑問句：把was或were放于句首。

    4. 用法
    1) 過去進(jìn)行時(shí)表示過去某段時(shí)間內(nèi)持續(xù)進(jìn)行的動作或者事情。
    We were watching TV from seven to nine last night.
    昨天晚上七點(diǎn)到九點(diǎn)的時(shí)候我們在看電視。      
    2) 過去進(jìn)行時(shí)可以表示在過去某個時(shí)間點(diǎn)發(fā)生的事情。
    時(shí)間點(diǎn)可以用介詞短語、副詞或從句來表示。
    What was she doing at nine o'clock yesterday?
    昨天晚上九點(diǎn)她在做什么？ (介詞短語表示時(shí)間點(diǎn))
    She was doing her homework then.
    那個時(shí)候她正在寫作業(yè)。（副詞表示時(shí)間點(diǎn)）
    When I saw him he was decorating his room.
    當(dāng)我看見他的時(shí)候他正在裝飾房間。 (when從句表示時(shí)間點(diǎn))
    3) 在復(fù)合句中，如果主要動作和背景動作都是延續(xù)的或同時(shí)發(fā)生的，那么主從句的動詞都可用過去進(jìn)行時(shí)。
    When he was waiting for the bus, he was reading a newspaper.
    他邊等車邊看報(bào)。 (兩個動作都是延續(xù)的)
    He was cleaning his car while I was cooking.
    他擦車時(shí)我在做飯。(兩個動作同時(shí)進(jìn)行)